feat: add DISPLAY_NAME_RESTRICTION_ENABLED toggle

Allows disabling the display name restriction middleware via .env.
Users with special characters in their Telegram name (e.g. "@")
were blocked from using the bot entirely. Default: true (enabled).

Set DISPLAY_NAME_RESTRICTION_ENABLED=false to disable.

app/config.py

@@ -436,6 +436,7 @@ class Settings(BaseSettings):
     MULENPAY_LANGUAGE: str = 'ru'
     MULENPAY_VAT_CODE: int = 0
 
+    DISPLAY_NAME_RESTRICTION_ENABLED: bool = True
     DISPLAY_NAME_BANNED_KEYWORDS: str = '\n'.join(DEFAULT_DISPLAY_NAME_BANNED_KEYWORDS)
     MULENPAY_PAYMENT_SUBJECT: int = 4
     MULENPAY_PAYMENT_MODE: int = 4

app/middlewares/display_name_restriction.py

@@ -85,6 +85,9 @@ class DisplayNameRestrictionMiddleware(BaseMiddleware):
         if not user or user.is_bot:
             return await handler(event, data)
 
+        if not settings.DISPLAY_NAME_RESTRICTION_ENABLED:
+            return await handler(event, data)
+
         display_name = self._build_display_name(user)
         username = user.username or ''